Hello gregw_100, thanks for getting in touch with us and sorry to hear you are unable to download the game.
What is the exact title of the Settlers game you are trying to download/launch from Ubisoft Connect please, so that I may check this?
Can I also check, if you locate the games .exe file in its installation path, do you have this set to run as an administrator in the games Properties tab, under Compatability mode?
If you have the game tile already downloaded in your launcher, but the game does not open, can you please try verifying your games files using this tool >
https://www.ubisoft.com/help?article=000060529